save project

snake.py

@@ -51,12 +51,14 @@ while True:
     else:
         y+=30
     if x==a_x and y==a_y:
-        a=random.randint(0,22)
-        b=random.randint(0,12)
+        a=random.randint(0,21)
+        b=random.randint(0,11)
         a_x=a*30
         a_y=b*30
-    zuo.append((x,y))
+    else:
         zuo.pop(0)  
+    zuo.append((x,y))
+    
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
     screen.blit(xiang,zuo[-1] )